BSC 121-102 Week 3 Notes
BSC 121-102 Week 3 Notes Bsc121
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This 5 page Class Notes was uploaded by Amber Daniels on Monday September 14, 2015. The Class Notes belongs to Bsc121 at Marshall University taught by Dr. Axel in Summer 2015. Since its upload, it has received 68 views. For similar materials see General Biology in Biological Sciences at Marshall University.
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Date Created: 09/14/15
BSC 121102 Week 3 Notes Dr Anne Axel 99911 NOTE We did not have class on the 7th due to Labor Day so only two days of notes this week 99 Symbiosis Q We started off class talking about the three toed sloth and how aglae lives in their fur and this is good for the sloths because the algae is high in lipids and supplements their low protein diet 0 Within the algae moths lives and when the sloths climb down to the forest floor to defecate the moths lay their eggs in the sloth feces and thus starts another cycle of life This is a great example of symbiosis Q Choanoflaoellate freeliving singlecell and colony forming eukaryotes that survive in aquatic environments expected to know Excavata Q Earliest of eukaryotic cells 0 First after archaea and bacteria 0 Many have a feeding groove kind of like a mouth but not a mouth 0 Phagocytosis food is enveloped inside a food vacuole digesteddigestive enzymes break apart bacteria then waste is emitted Endosvmbiotic Theorv Q Phagocytosis provides a way for cells to take in other cells that eventually develop into mitochondria or chloroplasts aerobic bacterium turn into mitochondriaphotosynthetic bacterium turn into chloroplasts expected to know Land Plants Most simple plant moss Most complex trees Trees make wood flowers and fruits Moss has no vascular system Vascular systems help to move nutrients thus creating a large plant Bryophytes 911 Simple and small No vascular system Live in moist areas close to the ground Can t survivereproduce in dry places sperm are motile flagellates and need moisture to travel Diploid a cell consisting of two sets of chromosomes one is usually from the mother and another set is from the father 0 somatic cells 0 gametophyte O O O Haploid a cell having half of the number of chromosomes in Gametophyte is anchored in the ground sporophyte grows from Plant fitnesslargest amount of spores Mosses and ferns use spores to reproduce more advanced plants have seeds Ferns Used to be really tall Vascular tissues Have protective waxy cuticle Stomata Hole that brings in air don t see in earlier ferns No seeds Advantages of a Vascular Svstem Can receive water and nutrients Allows plant to grow taller Ferns are more productive because they have larger sporophytes Earlv Adaptations of Land Plants Bodies are composed of 3D tissues Tissues provide an increased ability to avoid water loss Tissues form from actively dividing cells occur at growing tips Distinctive reproductive features Plants are Producers O O O Lycophytes O O O 0 time All life on Earth is directlyindirectly reliant on primary production Primarv Production Things that photosynthesise and provide food for others Base of our food chain Leaf Innovations Have more complex leaf structures Related to fern Smaller leaves Alternation of Generations Land plant produce 2 types of multicellular bodies that alternate in Sporophyte diploid produces spores Gametophyte haploid produces gametes must know why each are importan t Plant Embrvo Critical Innovation of land plants Develop from zygote Multicellular Diploid Enclosed by maternal tissues that provide sustenance sugars Maternal tissues protects embryo from heat drought microbes If the mother didn39t have to put so much energy into the embryo she would get bigger Plant Fitness More spores more fitness Larger diploid more spores Fern Gametonhvte Need water for fertilization Gametophyte generation is dependant on sporophytes Slow growth rate Seedless Plants Transformed Earth39s Ecoloqv Essential to development of first substantial soils ecolution modern plant communities ability of animals to colonize land Broke up rocks and cold lava that had formed after eruption to make the land easier to colonize Reduced the concentration of C02 Plant evolution results in plants that have larger and more complex sporophyte generations Seed Plants Conifers and flowering plants Unique reproductive structures Ovule sporangium that contains single spore Develops into very small egg Sperm supplied by pollen Embrvos Develon from Fertilization Fertilization occurs after pollination Pollination occurs by wind or animal transport very efficient vanosnerms Exposed seeds Produce wood Vascular cambium protects thick layers of wood vanosnerms Naked Seeds High nutritional value full of protein A lot of energy put into making seeds No longer reliant on water Pine could grow in sand huge improvement Gametophytes are dependant on sporophyte vanosnerm Seeds Q Consists of embryo and food supply surrounded by a thick coat 0 Some seeds rely on being digested by an animal to germinate tears up the coating in a good way and lives off of poop m 0 Cuticle protects plant 0 Stomata prevents water lossmust open for gas to come in Q Needles are leaves that are reduced in size so they don39t lose water 0 Tracheids water conducting cells
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